k-Wave

1. sschlatt
   

   Member
   Joined: Feb '17
   Posts: 2

   Hi,

   I would like to simulate US recording of a heterogeneous medium.
   I use a transducer object as a source.
   But because I would like to include directivity of transducer elements at reception (NOT like the directivity setting of the k-wave toolbox), I use a different sensor defined using a mask, which records ux (ux is needed to apply the directivity).
   The raw-data I obtain by recording ux is however very strange and the pressure calculated by P = -ux*c0*rho0 is not close to the pressure recorded.

   With one difference in acoustic impedance (one interface) for example, pressure has a zero mean inside the homogeneous medium (which is correct) and one echo (the interface), the pressure calculated using the velocity however has a non-zero mean!

   What could cause this behaviour? Could it be related to the configuration?

   Thanks for your help!

   Posted 7 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi sschlatt,

   You can only relate pressure and particle velocity in this way in 1D (i.e., for a plane wave travelling in the x-direction). In the more general case, the pressure and particular velocity won't be in phase, and the specific acoustic impedance will be complex.

   Brad.

   Posted 7 years ago #

3. sschlatt
   

   Member
   Joined: Feb '17
   Posts: 2

   Hi,

   Thanks for your reply.
   I could fix the error using a larger PML.

   S. Schlatter

   Posted 7 years ago #

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